P3012moderate severityPowertrain
Camshaft Profile Actuator B Stuck Bank 1
on 2005 Audi A6 4.2L V8 · AWD
What this code means
The camshaft profile switching actuator for Bank 1, exhaust side, is mechanically stuck. The exhaust cam profile affects scavenging and emissions.
Symptoms
- Check Engine Light
- Poor emissions performance
- Reduced engine braking
- Slight power loss
- Failed emissions test
Common causes
- Oil sludge in actuator passages
- Faulty solenoid
- Low oil pressure to actuator
- Worn actuator mechanism
- Carbon deposits
Diagnostic steps
- Check oil condition and level
- Command exhaust cam profile switch
- Monitor cam profile position PID
- Test oil pressure at actuator
- Inspect actuator for carbon buildup
Repair notes
Replace exhaust cam profile actuator. Perform engine oil flush if sludge is present.
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